Mechanical Engineering - Engineering Mechanics - Discussion

In nature friction is only three types are available in air we called air resistance in liquids we called -viscosity in Solids we called friction. According to discussion friction basically two types 1st static friction and 2nd dynamic friction according to discussion dynamic means motion (any object which can observed as motion) and friction is surface property which can exert when two or more then bodies are contact and also known motion opposing force.

And dynamic friction is define when body is experienced motion then those force exert on body as a retarding parameter or to reduce the motion of body then body experienced dynamic friction.

Rolling Friction: The resistance force of the body when it rolls on the surface.

Dynamic Friction: Is also known as kinetic friction, is a resistance of body between moving surface of moving body to steady surface of steady body.

Limiting Friction: The maximum force that can be used to start motion of the body.

Static Friction: The force required to keep body at rest.

@Niel, you are absolutely correct. But the most appropriate answer is Dynamic friction. All the rolling friction is a dynamic friction but the reverse is not true. A relative motion of a block on a slope is a dynamic friction and not a rolling friction. A ball bearing or wheels moving on a road experience rolling friction which may be termed as dynamic friction even.

The friction experienced by a body in motion is known as dynamic friction. The body enters into motion when the force acting on it is greater than the limiting friction.

Dynamic friction is the type of friction that now exists between the contact surfaces. The limiting static friction is always less than the dynamic friction.

@Deepak Sharma & @Dinesh.

When a body is rolling on a surface it will be acted by a certain amount of friction between surface is called rolling friction.

When a body is in rest and the amount of friction it is acting towards the surface just before it is going to motion is called limiting friction.

Dynamic Friction: Dry friction resists relative lateral motion of two solid surfaces in contact. The two regimes of dry friction are 'static friction' ("stiction") between non-moving surfaces and kinetic friction (sometimes called sliding friction or dynamic friction) between moving surfaces.

Here, n case, if anybody experiences an external force resulting from its motion, it is said to have the dynamic (kinetic) motion.

While, if the body is in motion but not because of any external force, then it may be included in kinematics.

In case, if any body experiences an external force resulting into its motion, it is said to have the dynamic(kinetic) motion.

While, if body is in motion but not because of any external force, then it may b included in kinematics.

Kinetic friction, also known as dynamic or sliding friction occurs when a body is in relative motion with another, with their surfaces in contact. It is the frictional force that slows down, and eventually stops a moving object.

Dynamics when body is in motion. When a body slides over another body friction occurs in between the two body. The friction offers resistance to the motion of the sliding body that's why motion called as dynamics motion.